must staff
Verbo regular: staff - staffed- staffed

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must staff
you must staff
he must staff
we must staff
you must staff
they must staff 	I must be staffing
you must be staffing
he must be staffing
we must be staffing
you must be staffing
they must be staffing	I must have staffed
you must have staffed
he must have staffed
we must have staffed
you must have staffed
they must have staffed	I must have been staffing
you must have been staffing
he must have been staffing
we must have been staffing
you must have been staffing
they must have been staffing	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must not staff
you must not staff
he must not staff
we must not staff
you must not staff
they must not staff 	I must not be staffing
you must not be staffing
he must not be staffing
we must not be staffing
you must not be staffing
they must not be staffing	I must not have staffed
you must not have staffed
he must not have staffed
we must not have staffed
you must not have staffed
they must not have staffed	I must not have been staffing
you must not have been staffing
he must not have been staffing
we must not have been staffing
you must not have been staffing
they must not have been staffing	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I staff?
must you staff?
must he staff?
must we staff?
must you staff?
must they staff? 	must I be staffing?
must you be staffing?
must he be staffing?
must we be staffing?
must you be staffing?
must they be staffing? 	must I have staffed?
must you have staffed?
must he have staffed?
must we have staffed?
must you have staffed?
must they have staffed? 	must I have been staffing?
must you have been staffing?
must he have been staffing?
must we have been staffing?
must you have been staffing?
must they have been staffing? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I not staff?
must you not staff?
must he not staff?
must we not staff?
must you not staff?
must they not staff? 	must I not be staffing?
must you not be staffing?
must he not be staffing?
must we not be staffing?
must you not be staffing?
must they not be staffing? 	must I not have staffed?
must you not have staffed?
must he not have staffed?
must we not have staffed?
must you not have staffed?
must they not have staffed? 	must I not have been staffing?
must you not have been staffing?
must he not have been staffing?
must we not have been staffing?
must you not have been staffing?
must they not have been staffing?